Schweinepriester (literal translation Swine priest) is a German pejorative denoting a repugnant male person. Grimm's Deutsches Wörterbuch defines Schweinpriester or Schweinepriester as a word for an unclean or foul-mouthed person (an unreinlichen oder unflätigen Menschen).
The expression is documented since the 19th century. Originally, it denoted swine-herders in the service of a monastery who were also tasked with castrating of piglets.
References
Schweinepriester Wikipedia(Text) CC BY-SA